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Intangible Assets (Details) (Licenses, USD $) In Thousands, unless otherwise specified | 3 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2014 U.S. Cellular | Mar. 31, 2013 U.S. Cellular | Mar. 31, 2014 Wireline | Dec. 31, 2013 Wireline | Mar. 31, 2013 Wireline | Dec. 31, 2012 Wireline | Mar. 31, 2014 Non-Reportable Segment | Dec. 31, 2013 Non-Reportable Segment | Mar. 31, 2013 Non-Reportable Segment | Dec. 31, 2012 Non-Reportable Segment
Licenses |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period | $ 1,423,779 | $ 1,480,039 | $ 1,405,759 | $ 1,462,019 | $ 2,800 | $ 2,800 | $ 2,800 | $ 2,800 | $ 15,220 | $ 15,220 | $ 15,220 | $ 15,220
Acquisitions | 9,100 | 14,150 | 9,100 | 14,150 |  |  |  |  |  |  |  |
Exchanges, net | 15,719 |  | 15,719 |  |  |  |  |  |  |  |  |
Balance, end of period | $ 1,448,598 | $ 1,494,189 | $ 1,430,578 | $ 1,476,169 | $ 2,800 | $ 2,800 | $ 2,800 | $ 2,800 | $ 15,220 | $ 15,220 | $ 15,220 | $ 15,220

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- Definition Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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